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GCN Circulars

GCN Circulars are rapid astronomical bulletins submitted by and distributed to community members worldwide. They are used to share discoveries, observations, quantitative near-term predictions, requests for follow-up observations, or future observing plans related to high-energy, multi-messenger, and variable or transient astrophysical events. See the documentation for help with subscribing to or submitting Circulars.

Search for Circulars by submitter, subject, or body text (e.g. 'Fermi GRB').
To navigate to a specific circular, enter the associated Circular ID (e.g. 'gcn123', 'Circular 123', or '123').
Advanced Search

To narrow the search results, use advanced search syntax. This allows for specifying which circular field to search (submitter, subject, and/or body). For additional information, refer to the advanced search documentation.

Advanced Search Examples (click to copy):

subject:"Swift"
body:"GRB"
submitter:"Judith Racusin"

41641 results found.

  1. GRB030329: BV photographic observations
  2. GRB 030329 Optical observations
  3. GRB 030329, color evolution
  4. GRB 030329: possible color change
  5. GRB030329: RTT150 optical observations
  6. GRB 030329: Supernova Spectrum Emerging
  7. GRB030329: Kiso B and R band observations
  8. GRB030329: RTT150 optical observation
  9. GRB030329: More AAVSO VR obs
  10. GRB030328: R upper limit after 6 hours by MASTER
  11. GRB 030329: BV photographic observations
  12. GRB 030329: SARA Optical Observations
  13. GRB 030329: SARA Optical Observations
  14. GRB 030329, BVRI photometry
  15. GRB030329: Optical observations
  16. SDSS 0.5m PT observations of GRB030329 (correction)
  17. SDSS 0.5m PT observations of GRB030329
  18. GRB 030329, Optical observations
  19. GRB030329, cessation of fading
  20. GRB030329: final R-band light curve by MASTER
  21. GRB030329 - more 15 GHz radio data
  22. GRB030329 Radio 23/43/90 GHz observations at Nobeyama
  23. GRB 030329: Sub-millimeter detection
  24. GRB 030329: SARA Optical Observations
  25. GRB 030329: SARA Optical Observations
  26. OT GRB light curves and SN predictions
  27. GRB030329, optical observation
  28. GRB030329, new UBVRcIc field photometry
  29. GRB030329: optical observations at Tokyo Tech
  30. GRB 030329: optical observations
  31. GRB030329: multiple re-brightening phases
  32. GRB 030329, BRI photometry
  33. GRB030328: Full Observation, X-ray Fading and Spectrum Measured
  34. GRB 030329 , SPM optical observations
  35. GRB030329: Optical observations at Teramo
  36. GRB 030329: Radio observations at GMRT
  37. GRB030329: more 15GHz observations
  38. Further AAVSO V,B,R observations of GRB030329
  39. GRB 030329: Additional Mt. Laguna Optical Observations
  40. GRB 030329: SARA Optical Observations
  41. GRB 030329: Observations with ANDICAM
  42. GRB030329: Optical observations
  43. GRB030329: further optical photometry and evidence for a light curve discontinuity
  44. GRB 030329: Correction to GCN 2056
  45. GRB 030329: fitting parameters and re-brightening
  46. GRB 030329: KAIT optical photometry
  47. GRB030329 Further RBO Optical Observations
  48. GRB 030329: SARA Optical Observations
  49. AAVSO V & R observations of GRB030329
  50. GRB 030329: optical observations
  51. GRB 030329: beginning of the new fading phase in optical band
  52. GRB 030329, optical spectroscopy
  53. GRB 030329: fading X-ray afterglow with RXTE
  54. GRB 030329: optical photometry
  55. GRB030329: Optical observations
  56. Photometry of GRB030329 - Constant OT Magnitude
  57. GRB 030329, R-band observations
  58. GRB 030329: further optical observations
  59. GRB030329 - OT brightens
  60. GRB 030329: OT observations at Kanazawa
  61. GRB030329 15 GHz radio observation
  62. GRB 030329 RBO V Optical Observations
  63. GRB 030329, optical photometry
  64. GRB030329: Near Infrared Observations
  65. GRB 030324: Optical and NIR Observations
  66. GRB 030328, optical photometry
  67. GRB030329: R band light curve by MASTER
  68. GRB030329 - Light curve flattening
  69. GRB 030329: SARA Optical Observations
  70. GRB 030324, optical search
  71. GRB030329 - near contemporaneous optical limits from CONCAM
  72. GRB030329: R and B observations
  73. GRB 030329, optical observations
  74. GRB030329: Optical observations
  75. GRB030328: X-ray Fading and Spectrum Measured with Chandra
  76. GRB 030329: Light curve observed during the change of its slope.
  77. GRB030329, BVRcIc field photometry
  78. GRB030329, SPM optical observations
  79. GRB 030329: Optical Decay
  80. Redshift of GRB 030329
  81. GRB030329: ROTSE network observes steepening of decay curve
  82. GRB 030329, optical photometry
  83. GRB 030329: Optical decay and synthesis
  84. GRB030329 optical observations
  85. GRB030329: optical spectroscopy with the TNG
  86. GRB 030329: Radio Observations
  87. GRB 030329, optical spectroscopy
  88. GRB 030329: still bright
  89. GRB 030329: Optical pre-Imaging
  90. GRB 030329: visual observations
  91. GRB 030329: Upper limit from 5.6 hours before trigger
  92. GRB030328: R optical observation
  93. GRB030328: X-ray Afterglow Observed with Chandra
  94. GRB 030323: Gemini South VRI obsevations.
  95. GRB030329: Optical observations
  96. GRB 030329, R-band observations, supplement
  97. GRB030329 optical observations
  98. GRB030329:optical observations by MASTER
  99. GRB 030329: optical observations
  100. GRB 030329, R-band observations

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